This is the definitive book on the Domain Name System (DNS), the powerful scheme that facilitates the translation of English-like domain names (www.amazon.com) into computer-comprehensible Internet Protocol (IP) addresses (208.216.182.15). If you run a DNS server of any kind, particularly under Unix, you need to have this book on hand.

This book's early chapters give a view of DNS from high altitude, explaining basic concepts such as domains, name servers, and name resolution. From there, the authors proceed on a more practical tack, presenting specific instructions for setting up your own domain and DNS server using BIND. The authors then tell you what to do as your domain grows and you need to add more machines, subdomains, and greater throughput capacity. They also talk a lot about nslookup and C programming with the various DNS and BIND libraries. Administrators will find the chapter on BIND debugging output particularly helpful. Here, the authors translate BIND's mysterious error messages and offer specific strategies for fixing and optimizing the program. This edition covers BIND 8.1.2, but pays lots of attention to older versions that are still in wide use (4.8.3 and 4.9). The authors are careful to note differences among the versions. --David WallDNS and BIND discusses one of the Internet's fundamental building blocks: the distributed host information database that's responsible for translating names into addresses, routing mail to its proper destination, and many other services. As the authors write in the preface, if you're using the Internet, you're already using DNS -- even if you don't know it.

The third edition covers BIND 4.9, on which most commercial products are currently based, and BIND 8, which implements many important new features and will be the basis for the next generation of commercial name servers. It also covers topics like DNS security (greatly improved with BIND 8.1), asynchronous notification of changes to a zone, dynamic updates, and programming with Perl's Net::DNS module.

Whether you're an administrator involved with DNS on daily basis, or a user who wants to be more informed about the Internet and how it works, you'll find that this book is essential reading.

Topics include:

• What DNS does, how it works, and when you need to use it
• How to find your own place in the Internet's name space
• Setting up name servers
• Using MX records to route mail
• Configuring hosts to use DNS name servers
• Subdividing domains (parenting)
• Securing your name server: restricting who can query your server, preventing unauthorized zone transfers, avoiding bogus name servers, etc.
• Mapping one name to several servers for load sharing
• Troubleshooting: using nslookup, reading debugging output, common problems
• DNS programming, using the resolver library and Perl's Net::DNS module

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